217348473 has 4 divisors (see below), whose sum is σ = 289797968. Its totient is φ = 144898980.

The previous prime is 217348463. The next prime is 217348477. The reversal of 217348473 is 374843712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 217348473 - 2⁵ = 217348441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217348477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36224743 + ... + 36224748.

It is an arithmetic number, because the mean of its divisors is an integer number (72449492).

Almost surely, 2^217348473 is an apocalyptic number.

It is an amenable number.

217348473 is a deficient number, since it is larger than the sum of its proper divisors (72449495).

217348473 is an equidigital number, since it uses as much as digits as its factorization.

217348473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72449494.

The product of its digits is 112896, while the sum is 39.

The square root of 217348473 is about 14742.7430622663. The cubic root of 217348473 is about 601.2459968066.

The spelling of 217348473 in words is "two hundred seventeen million, three hundred forty-eight thousand, four hundred seventy-three".